521 with Holley Sniper 4500

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Post  Nick63Galaxie on December 17th 2019, 3:28 pm

I just recently ran my 521 stroker on the engine dyno at Danzio performance.  The engine made 720hp and 695 torque.  I have listed the specs on the engine below.  The Sniper EFI worked very well.  It tuned in nicely.  I am happy with the power the enigne made.  The youtube video isn't of the 720hp run. I have some pics of the dyno figures to post as well.

Scat Forged 4.3 stroke crank
Scat H Beam rods w/ARP 2000 bolts
CP forged Pistons
DSS main cap girdle with ARP studs
Kaase Oil Pump
Comp 304BR-8 cam w/solid roller lifters
Comp Ultra Pro Magnum Roller rockers with stud girdle
Kaase P-51 Heads
TrickFLow Mafia intake gasket matched to the P-51 heads
Canton 7 quart road race oil pan
Holley Sniper 4500 EFI w/ Hyperspark Ignition.



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521 with Holley Sniper 4500 Img_0211
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Post  wickettoby1 on December 23rd 2019, 10:54 pm

What’s the comp ratio?

Any work done to the cylinder heads?

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Post  Mike R on December 24th 2019, 12:13 am

Congrats, that's a serious  street piece in a great looking car. Is this a pump gas build?

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Post  Hwyhogg on December 28th 2019, 8:40 am

Have you had the sniper long? I’m torn between a TBI and a multiport system. Looking for upgrade from carb. It’s a street cruiser. I have CJ heads, and am looking for the least expensive alternatives. Thanks

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Post  jasonf on December 28th 2019, 5:43 pm

Hwyhogg wrote:Have you had the sniper long?  I’m torn between a TBI and a multiport system.  Looking for upgrade from carb.  It’s a street cruiser. I have CJ heads, and am looking for the least expensive alternatives. Thanks


Well if you are looking for inexpensive TBI is your only option.
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Post  Nick63Galaxie on January 9th 2020, 8:55 pm

wickettoby1 wrote:What’s the comp ratio?

Any work done to the cylinder heads?

The cop ratio is 10:1 and the heads are straight out of the box. I did gasket match the intake to the heads.
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Post  Nick63Galaxie on January 9th 2020, 8:56 pm

Mike R wrote:Congrats, that's a serious  street piece in a great looking car. Is this a pump gas build?

Thank you. Yes the Dyno run was done on 91 octane. I plan to throw some boost through the engine down the road.
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Post  Nick63Galaxie on January 9th 2020, 9:04 pm

Hwyhogg wrote:Have you had the sniper long?  I’m torn between a TBI and a multiport system.  Looking for upgrade from carb.  It’s a street cruiser. I have CJ heads, and am looking for the least expensive alternatives. Thanks

I dont have it in the car just yet. I have installed 2 other Sniper systems. One was in a 72 Firebird with a mild 383 in it and it runs great. The other was in a 79 Jeep CJ7 runs great as well. Passed Ca smog with it! I dont really have any complaints about the Sniper setups. In my opinion you cant go wrong for the money. On my big block setup and the Firebird we have the Sniper controlling the timing as well. Both systems fired right up on the first try with out any issues. Then you have to put a little time into them and let them learn and adjust certain settings to fit your build and application. Port injection is great, but it is usually more expensive.
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